Not pretty, but ALIVE!
If it were me and thank God it is not, I'd plan on keeping him on the roster, but inactive on game day until after the Bye. That way you preserve the IR/Return slot for the unexpected need as Clowney uses the first half of the season as his training camp. Only then would I work him into games as the opportunity presents itself. But I'm a cautious type by nature.Clowney in minimal 2014 exposure looked really good before injury with little prep time. My 2 cents is to hold him out until game one and then pick his spots to play for first few games .